Article
Chemistry, Applied
Yuan Fang, Heng Zhao, Xiaoyu Guo, Yingluo He, Guohui Yang, Noritatsu Tsubaki
Summary: This study designs a novel core-shell structured catalyst, comprised of Rhodium nanoparticles (Rh NPs) homogeneously encapsulated in a silicalite-1 zeolite (Rh@S-1), for 1-hexene hydroformylation. The catalyst exhibits a high conversion of 1-hexene up to 85.8%, and a ratio of n-heptanal to iso-heptanal reaching 2.5 at 90 degrees C. The outstanding catalytic activity of this core-shell structured catalyst can be explained by the highly active homogeneously dispersed Rh NPs and the distinguishable mass transfer effect of the unique and orderly micropores structure of silicalite-1 zeolite.
Article
Chemistry, Applied
N. Sudheesh, Sumeet K. K. Sharma, Ram S. S. Shukla
Summary: HRh(CO)(PPh3)(3) encapsulated catalysts were synthesized using templates of C-10 - C-18 chain lengths and their effect on hydroformylation was studied. The pore structure was found to significantly impact the conversion and selectivity. Catalysts with lower chain length templates had smaller pore diameter and volume, resulting in lower conversion for all substrates. Aldehyde selectivity decreased at lower time for 1-hexene but increased with increasing template chain length. Recycling studies showed the precise effect of catalyst pore size, with larger pores leading to leaching of Rh-complex.
JOURNAL OF POROUS MATERIALS
(2023)
Article
Energy & Fuels
Luhaibo Zhao, Qing Sun, Zhiyong Tang
Summary: In this study, the hydroformylation of 1-hexene was experimentally investigated using the micro-bubbling process as an intensification method. A computational fluid dynamics model was established to describe the multi-phase flow and reaction process. The results showed that the microbubble sizes and internal components significantly affected the performance of the reaction system.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2022)
Article
Chemistry, Applied
Badria M. Al-Shehri, Sahar K. Mohamed, Shaykha Alzahly, Mohamed S. Hamdy
Summary: Neodymium was incorporated into three-dimensional mesoporous siliceous material TUD-1, forming highly distributed Nd3+ ions in the silica matrix. The adsorption capacity of Nd-TUD-1 for methyl green dye was over 24 times higher than neat TUD-1 material, fitting perfectly with pseudo-second-order model.
JOURNAL OF RARE EARTHS
(2021)
Article
Energy & Fuels
Nithin B. Kummamuru, Geert Watson, Radu-George Ciocarlan, Sammy W. Verbruggen, Pegie Cool, Pascal Van der Voort, Patrice Perreault
Summary: This study explores the potential of two hydrophobic porous materials in promoting methane clathrate formation. The results show that both materials can facilitate the formation of methane clathrates under mild operating conditions and have high methane storage capacities. Overall, the study concludes that these materials are effective promoters of methane clathrates, making clathrate-based methane storage and transport technology industrially viable.
Article
Chemistry, Applied
Nitin S. Pagar, Prashant R. Karandikar, Asha J. Chandwadkar, Raj M. Deshpande
Summary: Novel mesostructured silica materials and mesoporous carbon molecular sieves were prepared by using specific compounds as templates and silica sources, with successful immobilization of a rhodium complex for improved catalytic activity in hydroformylation reactions compared to traditional activated carbon supports.
JOURNAL OF POROUS MATERIALS
(2021)
Article
Energy & Fuels
Suraya Zulkepli, Hwei Voon Lee, Noorsaadah Abd Rahman, Ling Tau Chuan, Pau Loke Show, Wei-Hsin Chen, Joon Ching Juan
Summary: The interest in sustainable hydrocarbon-like biofuel production is increasing, and Fe/HMS catalyst has shown potential in efficiently producing diesel-range biofuel. The catalyst's performance is attributed to well-dispersed Fe in the hematite phase, interaction between Si-OH and Fe-O bonds, acidity, surface area, and pore size enhancements. This result indicates Fe/HMS catalyst as a potential DO catalyst for renewable hydrocarbon-like biofuel production.
Article
Energy & Fuels
Mingjie Liao, Xin Ning, Junwen Chen, Jiajun Zheng, Wenlin Li, Ruifeng Li
Summary: The synthesized mesoporous ZSM-5 zeolites showed better stability and higher initial activity in 1-hexene oligomerization compared to common ZSM-5 zeolite. The catalytic activity was closely related to the number and distribution of acid sites, with fewer and moderate strength of Bronsted acid sites inhibiting cracking and coke formation.
Article
Chemistry, Multidisciplinary
Alfonso Policicchio, Giuseppe Conte, Raffaele Giuseppe Agostino, Paolino Caputo, Cesare Oliviero Rossi, Nicolas Godbert, Isabella Nicotera, Cataldo Simari
Summary: Global warming and environmental concerns have led to global efforts to reduce anthropogenic carbon emissions, leading to a focus on mesoporous silica materials for their carbon capture properties. A recent study investigated the internal arrangement and diffusion properties of CO2 in silica mesopores, revealing multiple physisorbed species coexisting. Through C-13 NMR and C-13 PFG NMR analysis, it was found that CO2 in mesopores exhibited anisotropic long-range mobility with different diffusion coefficients depending on direction.
JOURNAL OF CO2 UTILIZATION
(2022)
Article
Biochemistry & Molecular Biology
Cristina Carucci, Nicola Scalas, Andrea Porcheddu, Marco Piludu, Maura Monduzzi, Andrea Salis
Summary: Mesoporous silica nanoparticles (MSN) functionalized with triethylenetetramine (MSN-TETA) showed higher adsorption capacity and slower release rate for the antimicrobial drug sulphamethizole (SMZ), indicating the importance of intermolecular interactions in drug delivery systems.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Pharmacology & Pharmacy
Simona Ionita, Daniel Lincu, Raul-Augustin Mitran, Laila Ziko, Nada K. Sedky, Mihaela Deaconu, Ana-Maria Brezoiu, Cristian Matei, Daniela Berger
Summary: Resveratrol, a naturally occurring polyphenol with antioxidant, cardioprotective and anticancer potential, has low aqueous solubility that limits its application. Encapsulation in mesoporous silica matrices and functional modification can increase its dissolution rate. The functionalized mesoporous carriers showed high anticancer activity, highlighting their potential use in cancer treatment.
Article
Chemistry, Physical
N. Sudheesh, Ram S. Shukla
Summary: Various strategies using heterogeneous catalysts were investigated for the selective synthesis of jasminaldehyde. One effective strategy involved the periodic addition of heptanal to maintain the heptanal:benzaldehyde ratio, resulting in high conversion and selectivity. Another strategy involved a tandem reaction, combining hydroformylation of 1-hexene to heptanal with aldol condensation of heptanal and benzaldehyde to jasminaldehyde.
REACTION KINETICS MECHANISMS AND CATALYSIS
(2022)
Article
Engineering, Chemical
Juncong Yuan, Ranfei Fu, Lunrui Fan, Yaqi Dong, Ze Zong, Hui Kang, Hao Yan, Yibin Liu, Xingong Zhang, Guanghui Zhao, Xuliang Deng, Yongjun Zhang, Jincheng Liu, Chaohe Yang, Honghong Shan, De Chen, Xiang Feng
Summary: Covering the Ti-sites on the external surface of TS-1 can enhance the selectivity of 1,2-epoxyhexane. This environmentally friendly strategy avoids sacrificing the activity of internal Ti sites and successfully inhibits the ring-opening reaction. Compared to conventional catalysts, the surface-covered ITS-1 catalyst significantly improves the selectivity of 1,2-epoxyhexane while maintaining high conversion.
Article
Chemistry, Multidisciplinary
Hui Dai, Siqi Xiong, Yongqing Zhu, Jian Zheng, Lihong Huang, Changjian Zhou, Jie Deng, Xinfeng Zhang
Summary: In this study, nickel and nickel-cerium-containing hexagonal mesoporous silica catalysts were synthesized and applied in the reverse water gas shift reaction. The catalysts exhibited higher selectivity and activity compared to conventional impregnated catalysts. The introduction of cerium created active sites for CO2 activation, and the effect of H-2/CO2 molar ratio on the reaction was analyzed.
CHINESE CHEMICAL LETTERS
(2022)
Article
Engineering, Chemical
Emad A. Elshehy
Summary: The synthesized SiO2-DPTS sorbent, prepared by post-grafting method, demonstrates high efficiency in extracting U(IV) ions from uranyl leach liquor. The sorbent shows excellent adsorption performance under different experimental conditions and the mechanism of interaction with U(VI) ions is supported by density functional theory calculations.
CHEMICAL ENGINEERING & TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
N. Sudheesh, Manu Vasudevan, Haresh M. Mody, Hari C. Bajaj, Ram S. Shukla
Article
Chemistry, Physical
N. Sudheesh, Amit K. Chaturvedi, Ram S. Shukla
APPLIED CATALYSIS A-GENERAL
(2011)
Article
Chemistry, Physical
N. Sudheesh, Jaydeep N. Parmar, Ram S. Shukla
APPLIED CATALYSIS A-GENERAL
(2012)
Article
Chemistry, Physical
N. Sudheesh, Ram S. Shukla
APPLIED CATALYSIS A-GENERAL
(2013)
Article
Chemistry, Physical
N. Sudheesh, Ram S. Shukla
APPLIED CATALYSIS A-GENERAL
(2014)
Article
Chemistry, Inorganic & Nuclear
Aasif A. Dabbawala, N. Sudheesh, Hari C. Bajaj
DALTON TRANSACTIONS
(2012)
Article
Chemistry, Physical
N. Sudheesh, Sumeet K. Sharma, Ram S. Shukla
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
(2010)
Article
Chemistry, Physical
Tharun Jose, N. Sudheesh, Ram S. Shukla
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
(2010)
Article
Chemistry, Physical
N. Sudheesh, Sumeet K. Sharma, Munir D. Khokhar, Ram S. Shukla
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
(2011)
Article
Chemistry, Multidisciplinary
Adarsh S. Bhatt, Praful L. Sakaria, Manu Vasudevan, Radheshyam R. Pawar, N. Sudheesh, Hari C. Bajaj, Haresh M. Mody
Article
Chemistry, Physical
N. Sudheesh, Ram S. Shukla
Summary: Various strategies using heterogeneous catalysts were investigated for the selective synthesis of jasminaldehyde. One effective strategy involved the periodic addition of heptanal to maintain the heptanal:benzaldehyde ratio, resulting in high conversion and selectivity. Another strategy involved a tandem reaction, combining hydroformylation of 1-hexene to heptanal with aldol condensation of heptanal and benzaldehyde to jasminaldehyde.
REACTION KINETICS MECHANISMS AND CATALYSIS
(2022)
Article
Chemistry, Applied
N. Sudheesh, Sumeet K. K. Sharma, Ram S. S. Shukla
Summary: HRh(CO)(PPh3)(3) encapsulated catalysts were synthesized using templates of C-10 - C-18 chain lengths and their effect on hydroformylation was studied. The pore structure was found to significantly impact the conversion and selectivity. Catalysts with lower chain length templates had smaller pore diameter and volume, resulting in lower conversion for all substrates. Aldehyde selectivity decreased at lower time for 1-hexene but increased with increasing template chain length. Recycling studies showed the precise effect of catalyst pore size, with larger pores leading to leaching of Rh-complex.
JOURNAL OF POROUS MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Aasif A. Dabbawala, N. Sudheesh, Hari C. Bajaj
INDIAN JOURNAL OF CHEMISTRY SECTION A-INORGANIC BIO-INORGANIC PHYSICAL THEORETICAL & ANALYTICAL CHEMISTRY
(2015)
Correction
Chemistry, Multidisciplinary
Adarsh S. Bhatt, Praful L. Sakaria, Manu Vasudevan, Radheshyam R. Pawar, N. Sudheesh, Hari C. Bajaj, Haresh M. Mody