Article
Chemistry, Analytical
Meijia Liu, Gang Wang, Zhongdong Zhang, Zhengyu Li, Shunnian Xu, Ruipu Wang, Shengbao He
Summary: In order to improve the conversion of light alkanes, a method was proposed to promote the breakage of C-H bonds. Thermodynamic analysis showed that dehydrogenation cracking produced 15% higher yield of light olefins compared to protonation cracking, indicating that promoting C-H bonds cleavage could enhance the yield of light olefins. Bifunctional ZSM-5 zeolites modified with phosphorus and transition metals, especially Ag-P-ZSM-5, showed improved conversion of C5-C7 alkanes and yield of light olefins, attributed to the increased Lewis acid sites and the promotion of C-H bonds breakage.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Article
Chemistry, Analytical
Jing 'ai Shao, Hao Jiang, Mingfa Yang, Jianjun Xiao, Haiping Yang, Yingquan Chen, Shihong Zhang, Hanping Chen
Summary: This study investigated the effects of different metal-modified ZSM-5 catalysts on the production of light olefins from cellulose fast pyrolysis. It was found that Cu-ZSM-5 catalyst had the highest yield of light olefins. The results also suggested that increasing the other-pore volume and surface area, as well as medium and strong acidity of ZSM-5 catalyst, could promote the formation of light olefins.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
Article
Agricultural Engineering
Jingyuan Shang, Guangbin Fu, Zhenping Cai, Xiang Feng, Yongxiao Tuo, Xin Zhou, Hao Yan, Chong Peng, Xin Jin, Yibin Liu, Xiaobo Chen, Chaohe Yang, De Chen
Summary: This study investigates the regulation of olefin or aromatics yields from ex-situ catalytic pyrolysis of pine by impregnating Sn on ZSM-5 catalysts, showing that Sn/ZSM-5 increased aromatics yield while Sn/M-ZSM-5 boosted olefins yield. The synergistic effect plays a significant role in manipulating the distribution of products.
BIORESOURCE TECHNOLOGY
(2021)
Article
Energy & Fuels
Daniel Takyi Sekyere, Jinhong Zhang, Yaozheng Chen, Yansheng Huang, Mengfei Wang, Jiaxu Wang, Noah Niwamanya, Andrew Barigye, Yuanyu Tian
Summary: This study investigates the co-pyrolysis of pine and LDPE over different catalysts and finds that the addition of catalyst can greatly enhance the production of light olefins and aromatics. The optimal base and acid catalysts are calcium aluminate and ZSM-5 with Si/Al ratio of 40, respectively. The findings provide important insights for the production of light olefins and BTX from the catalytic co-pyrolysis of biomass and plastics.
Article
Chemistry, Physical
Yuen Bai, Guohao Zhang, Dongyang Liu, Yuhao Zhang, Liang Zhao, Jinsen Gao, Chunming Xu, Qingfei Meng, Xuhui Gao
Summary: This article highlights the current research progress on acid-catalyzed paraffin cracking for high yields of propylene and ethylene over modified ZSM-5 zeolite. Factors influencing the catalytic pyrolysis process, such as modified elements, post-treatment methods, and process conditions, are discussed. The effects of these factors on the production of light olefins and the catalytic pyrolysis mechanism are summarized, looking forward to future development in this field.
APPLIED CATALYSIS A-GENERAL
(2021)
Article
Engineering, Chemical
Xue-Yu Ren, Jing-Pei Cao, Yang Li, Zi-Meng He, Xiao-Yan Zhao, Tian-Long Liu, Xiao-Bo Feng, Yun-Peng Zhao, Hong-Cun Bai, Ji Zhang, Shi-Xuan Zhao
Summary: This study rigorously investigates the mechanism of light aromatics formation and coke growth during catalytic reforming of thermally derived volatiles over HZSM-5 under a H-2 atmosphere. It reveals the key mechanistic steps for the production of BTEXN products and the undesired coke. Competing adsorption between aromatics formation and catalytic coke reactions is observed.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Energy & Fuels
Yingkai Li, Nishu, Dominic Yellezuome, Chong Li, Ronghou Liu
Summary: This study evaluated the deactivation process and regeneration effects of bimetallic Fe-Ni/ZSM-5 catalysts in the catalytic pyrolysis of poplar sawdust. The results showed that the deoxygenation activity and hydrocarbon yield of the catalyst were influenced by the biomass/catalyst ratio. The coke resistance capacity of the catalyst was increased, and the regenerated catalyst retained deoxygenation activity with slightly reduced aromatic yield.
Article
Energy & Fuels
Jiehan Zhang, Mingyu Ma, Zhaohui Chen, Xinyu Zhang, Hang Yang, Xinkun Wang, Hongbo Feng, Jian Yu, Shiqiu Gao
Summary: Ex-situ catalytic pyrolysis of low-density polyethylene (LDPE) was performed using a two-stage fixed bed. Results showed that Ga/ZSM-5 and Ga/P/ZSM-5 catalysts were beneficial for the production of olefins and aromatics, and the introduction of P improved the selectivity of aromatics. Compared to in-situ catalytic pyrolysis, ex-situ catalytic pyrolysis was identified as a better method for processing plastic waste.
JOURNAL OF THE ENERGY INSTITUTE
(2023)
Review
Chemistry, Multidisciplinary
Yuchen Sha, Lei Han, Ruoyu Wang, Peng Wang, Haitao Song
Summary: In recent decades, steam cracking of hydrocarbons has been the major process for producing light olefins. Recent studies have shown that modified ZSM-5 zeolite can be used for hydrocarbon cracking to produce significant amounts of propylene and ethylene. Various modification methods and post-treatment techniques have been employed to improve the catalytic performance of ZSM-5 zeolite.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Engineering, Environmental
Nan Zhou, Leilei Dai, Yuancai Lyu, Yunpu Wang, Hui Li, Kirk Cobb, Paul Chen, Hanwu Lei, Roger Ruan
Summary: A structured catalyst with foam structure and zeolite coating was developed to achieve stable and highly selective catalytic pyrolysis of waste plastics. The structured catalyst demonstrated excellent stability and adjustable performance under different conditions.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
Huanling Zhang, Huixia Ma, Feng Zhou, Xiaolin Zhu, Guowei Wang, Chunyi Li
Summary: The study demonstrates that using ZSM-5 as a carrier of the Sn-based catalyst leads to high conversion of propane but poor selectivity. The addition of Sn species on the external and internal surfaces of the main channels improves the selectivity for propane dehydrogenation to propene. Furthermore, introducing Na enhances the selectivity of propene.
Article
Chemistry, Physical
Son Dong, Houqian Li, Iris K. Bloede, Abdullah J. Al Abdulghani, Edgard A. Lebron-Rodriguez, George W. Huber, Ive Hermans
Summary: The catalytic conversion of model compounds for plastic pyrolysis oil (1-octene, octadiene, octane, and toluene) over ZSM-5 in a fixed-bed reactor was investigated mechanistically. The conversion of 1-octene resulted in the production of benzene, toluene, xylene, coke, and hydrogen through a series of cracking, oligomerization, cyclization, and hydrogen transfer reactions. Octadiene mainly contributed to reactor fouling through thermal coking, while octane and toluene were converted through cracking reactions and disproportionation, dealkylation, and coking reactions, respectively. The use of mesoporous ZSM-5 maintained product selectivity for 70 hours in time-on-stream experiments.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Analytical
Xinyu He, Yajie Tian, Congzhen Qiao, Guozhu Liu
Summary: In this study, the acid properties of ZSM-5 zeolite catalysts were modified through secondary addition of aluminum. The modified catalysts showed significantly enhanced performance in cracking of n-pentane, leading to increased yield and improved catalytic stability.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
Article
Chemistry, Applied
Hagos Birhane Asfha, Ashenafi Hailu Berta, Nayoung Kang, Danim Yun, Jaedeuk Park, Yong-Ki Park, Kiwoong Kim
Summary: In this study, a reaction mechanism of light straight run naphtha cracking over micro-spherical catalyst containing HZSM-5 was systematically investigated. The results showed that light paraffins and olefins were the primary products, and oligomerization and β-scission cracking dominated the secondary reactions. Experiments on single hydrocarbon feeds indicated that BTX formation proceeded via the formation of cycloalkanes and cyclo-olefinic intermediates. Temperature and space time influenced the product selectivity, with propylene selectivity increasing at lower temperatures and ethylene selectivity increasing at higher temperatures.
Article
Agricultural Engineering
Yingkai Li, Dominic Yellezuome, Ronghou Liu, Junmeng Cai, Yu Gao
Summary: In this study, the product selectivity and kinetics of poplar sawdust catalytic pyrolysis over bi-metallic Fe-Ni/ZSM-5 were investigated using thermogravimetric analysis and Py-GC/MS. The results showed that Fe-Ni/ZSM-5 exhibited higher selectivity towards monocyclic aromatic hydrocarbons compared to monometallic catalysts. The addition of Fe-Ni/ZSM-5 also reduced the activation energy of the pyrolysis process, making it a potentially valuable catalyst for biomass conversion.
BIORESOURCE TECHNOLOGY
(2022)
Article
Chemistry, Physical
Ming-Yi Chen, Ngoc Thanh Thuy Tran, Ahmed Abubakar Alao, Wen-Dung Hsu
Summary: This study demonstrates the significance of surface Pt atom arrangement for the efficiency of ORR in PEMFCs and reveals the correlation between Pt-Pt average distance and O2 dissociation barrier. Furthermore, the study discovers a robust correlation between the level of the catalyst's d-band center and O2 adsorption energy. High-entropy alloy substrates provide potential for controlling Pt arrangement and O2 dissociation barrier.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Eduardo C. Atayde Jr, Babasaheb M. Matsagar, Yu-Cheng Wang, Kevin C. -W. Wu
Summary: This study presents the first application of an acidic MOF, Sulfated MOF-808, in catalyzing the HAA reactions of furan oligomers for the production of biofuel precursors. The catalyst showed high yield, selectivity, and recyclability, making it versatile for different starting materials.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Maria do Carmo Rangel, Francieli Martins Mayer, Soraia Jesus de Oliveira, Sergio Gustavo Marchetti, Fabricio Luiz Faita, Doris Ruiz, Giovanni Saboia, Mariana Kieling Dagostini, Jonder Morais, Maria do Carmo Martins Alves
Summary: This study developed a new catalyst by investigating the effect of magnesium on the catalytic properties of hematite in ethylbenzene dehydrogenation. The catalyst showed important differences in activity, selectivity, and stability, making it a promising candidate for commercial applications.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Yanjun Li, Qian Wang, Hui Tian, Mingyuan Zhu, Yuanyuan Liu
Summary: A novel strategy using microwave-assisted precipitation was proposed to prepare defective CsH3PMo11VO40 catalyst for the oxidation of methacrolein to methacrylic acid. Microwave treatment accelerates crystallization, increases vanadyl species content, and forms defective Keggin structures, thereby enhancing the oxidation capacity of the catalyst.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Rajeshwari Athavale, Sailee Gardi, Fatima Choudhary, Dayanand Patil, Nandkishor Chandan, Paresh More
Summary: In this study, a novel acidic ionic liquid catalyst was prepared and used for the synthesis of bis-indolyl methane derivatives. The catalyst exhibited short reaction times, easy purification, and reusability.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Masatomo Hattori, Takato Hattori, Masakuni Ozawa
Summary: Cu-added gamma-Al2O3 catalysts were prepared with varying Cu loadings and the effects of copper oxidation states on catalytic activity were investigated. The results showed that the addition of copper increased the catalyst activity, but excessive copper loading decreased catalytic activity. XRD and TEM analysis indicated the formation of a solid solution of copper oxide species on the surface of gamma-Al2O3. XAS and TPR data demonstrated variations in copper oxidation states among the catalysts.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Liwei Fang, Shiyang Niu, Shengsen Wang, Yiqing Lu, Yuanhui Cheng
Summary: In this study, PtNi alloy on nitrogen-doped carbon and SnO2 dual-support was designed to modulate the metal-support interaction, resulting in improved catalytic activity and stability for oxygen reduction reaction. The SnO2/PtNi/NC catalyst exhibited a strongly coupled interface, enhanced electron transfer, and higher half-wave potential compared to PtNi/NC and commercial Pt/C.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Shohei Harada, Duanxing Li, Kenta Iyoki, Masaru Ogura
Summary: This study investigates the catalytic performance of a composite catalyst composed of ZnZrOX and H-zeolite for the hydrogenation of CO2. The deactivation of the composite catalyst is influenced by ion exchange of Zn2+ and/or coke, with their effects differing based on the zeolite structure. Separating the grains of the composite catalyst can prevent deactivation.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Laura Proano, Christopher W. Jones
Summary: In this study, NiGa alloy particles supported on CeO2, ZrO2, and ZrO2-CeO2 solid solutions were prepared and characterized. The nature of the support was found to have a significant influence on the catalyst's activity and selectivity, with the crystalline structure of ZrO2 having the greatest impact. Pure ZrO2 showed the highest methanol selectivity and CO2 conversion at high Zr:Ce ratios. In equimolar and Ce-rich conditions, basic sites and oxygen vacancies were found to be the key parameters affecting methanol production.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Liyan Zhang, Yinze Yang, Leilei Zhou, Fengyu Zhao, Haiyang Cheng
Summary: 1,6-Hexamethylenediamine was successfully synthesized via the reductive amination of 1,6-hexanediol using a Ru/PRL(x)-Al2O3 catalyst. The highly dispersed and anchored Ru species, formed by 1,10-phenanthroline (PRL), played a crucial role in the catalytic reaction. The formation of new acid-base pairs, electron deficient Ru species, and smaller nanoparticles contributed to the improved catalytic performances of the Ru/PRL-Al2O3 catalyst.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Anita Horvath, Miklos Nemeth, Andrea Beck, Gyorgy Safran, Valeria La Parola, Leonarda Francesca Liotta, Gregor Zerjav, Matevz Roskaric, Albin Pintar
Summary: This study investigates the catalytic and structural changes caused by the addition of 0.25 wt% indium in a 3% Ni/CeO2-Al2O3 catalyst prepared by impregnation method. The results show that the addition of indium can decrease the activity of the catalyst, but it improves its stability and reduces coking.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Ankush Kularkar, Vaibhav Vilas Khedekar, Sachin D. Chaudhari, Mudavath Ravi, Sadhana S. Rayalu, Penumaka Nagababu
Summary: Efficiently addressing the challenges of photocatalytic CO2 reduction to CH3OH is crucial. This study developed Zn-BTC MOF and its composites with CaIn2S4, achieving highly efficient and robust photocatalytic CO2 reduction to CH3OH under ambient conditions, using H2O2 as the hydrogen source. Among the composites, ZMCIS4 demonstrated excellent performance with a CH3OH evolution of 49100 μmol/g.cat and a quantum efficiency of approximately 78.41%. The enhanced performance was attributed to the production of nascent hydrogen atoms (H center dot) through the photo-splitting of H2O2 on the ZMCIS surface.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Dan Liu, Yudong Li, Chengyu Wang, Haiyue Yang, Rong Wang, Shujun Li, Xiaohui Yang
Summary: In this study, a self-supporting three-dimensional porous Co3O4 nanobelt array decorated on nickel foam (P-Co3O4 -NBA@NF) electrode with numerous active sites was successfully constructed for the oxidation of 5-Hydroxymethylfurfural (HMF) to 2,5-furan dicarboxylic acid (FDCA). The P-Co3O4 -NBA@NF electrode demonstrated high conversion efficiency, selectivity, and Faraday efficiency, as well as remarkable long-term stability. This research provides a promising electrocatalyst for biomass conversion.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Yimin Li, Enggah Kurniawan, Fumiya Sato, Takayoshi Hara, Yasuhiro Yamada, Satoshi Sato
Summary: In this study, several silica-alumina catalysts modified with Ag were examined for the dehydration of 1,3-butanediol to 1,3-butadiene. Among them, an amorphous silica-alumina catalyst (SAL-3) modified with Ag showed the highest improvement in catalytic activity and stability when operated in H2 flow. The generation of reversible acid sites was found to be the reason behind the enhanced activity and stability of this Ag/SAL-3 catalyst. The effects of various parameters on the catalytic activity of Ag/SAL-3, such as reaction temperature, contact time, Ag content, and carrier gas, were investigated.
APPLIED CATALYSIS A-GENERAL
(2024)