Results 51 to 60 of about 83,093,681 (218)

Dealumination of ZSM-5 zeolites by steaming.

NIPPON KAGAKU KAISHI, 1989
ゼオライトの物理的および花学的性質は,ゼオライト骨格構造中の四配位アルミニウムに大きく依存する。したがって,ゼオライト骨格構造中からの脱アルミニウムは,ゼオライト触媒における重要な問題である。このような観点から本研究ではスチーミング処理にともなうZSM-5型ゼオライトからの脱アルミニウムについて定量的な検討を加えた。SiO2/Al2O3モル比の異なるH-ZSM-5を調製しf・873K-1気圧でのスチーミングにともなう骨格アルミニウム量の変化を固体高分解能27Al-NMRスペクトル,FT-IRから求めた。1その結果,脱アルミニウムの速度はみかけ上ゼオライト骨格中の四配位アルミニウム濃度の二次に比例することが明ちかになった。この結果は,ゼオライト細孔内を自由に動き回る非局在化したプゴトン(H+)がSi ...
Kunio SUZUKI, Tsuneji SANO, Yoshimichi KIYOZUMI, Hiroyuki HAGIWARA, Shigemitsu SHIN, Haruo TAKAYA   +5 more
openaire   +2 more sources

Sustainable Aviation Fuel—An Innovative Approach for Developing an Optimized Methanol‐Based Production Pathway

Chemie Ingenieur Technik, EarlyView.
Growing air traffic increases the contribution of aviation fuels to global emissions. With few viable alternatives for decarbonizing aviation, Sustainable Aviation Fuels (SAF) are a key lever. Green methanol enables a flexible synthetic production pathway, but realizing a specification‐compliant 100% drop‐in fuel requires overcoming significant ...
Thomas Streich, Harald Kömpel, Tobias Kimpel, Simone Bettinger, Michael Roth   +4 more
wiley   +1 more source

Utilização de zeolitas ZSM-5 na decomposição direta do monoxido de nitrogenio [PDF]

, 1996
Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro TecnologicoEste trabalho apresenta a atividade catalítica das zeólitas ZSM-5, para a reação de decomposição do NO, com diferentes razões molares de sílica/alumina (SAR), trocadas ...
Egues, Silvia Maria da Silva
core  

Stabilizing Zinc Anodes via a Zeolite‐Induced Localized Supersaturated Electrolyte Interface

Angewandte Chemie, Volume 138, Issue 44, 26 October 2026.
A low‐Si/Al‐ratio ZSM‐5 (LZ5) interphase induces a localized supersaturated electrolyte interface on Zn, with a local Zn2+ concentration exceeding 10 M in a 1 M ZnSO4 bulk electrolyte. Continuous Zn2+ enrichment within the zeolite nanochannels creates an H2O‐deficient, anion‐enriched solvation environment, promoting rapid desolvation, uniform ...
Xiaoqi Liu, Yipu Xu, Linjiao Wei, Hongman Sun, Zhengxing Qin, Xizhi Zhang, Dahai Zhang, Xianguo Li, Han Hu, Wei Xing, Yu Zhang, Bin Luo, Zifeng Yan   +12 more
wiley   +2 more sources

Synthesis of fly ash-based zeolite and experimentation in catalytic converter for NOx reduction on diesel engines: a comparative study

Scientific Reports
This study presents the synthesis of low-cost ZSM-5 zeolite-like materials from hazardous coal fly ash and their application as metal-doped catalysts for nitrogen oxides (NOx) reduction in diesel engine exhaust.
P. Rajakrishnamoorthy, M. Bakkiyaraj, Robert Cep, B. Swarna   +3 more
doaj   +1 more source

Experimental methods in chemical engineering: Temperature‐programmed desorption—TPD

The Canadian Journal of Chemical Engineering, EarlyView.
Abstract Temperature‐programmed desorption (TPD) characterizes the surface active sites of functional materials, such as adsorbents (metal hydrides, porous carbons, zeolites, metal–organic frameworks, for example) and catalysts. Solids surfaces are pre‐treated to remove moisture, contaminants, and previously adsorbed species, then a probe molecule (NH3$
Daniel A. Valdivieso‐Vera, Gregory S. Patience, M. Olga Guerrero‐Pérez   +2 more
wiley   +1 more source

Styrene and its natural analogues: accumulation and sustainable production methods

Journal of the Science of Food and Agriculture, EarlyView.
Abstract Styrene, also known as vinyl benzene, is a colourless, highly volatile petrochemical that serves as a key monomer in the production of polystyrene and styrene‐butadiene rubber. Its industrial synthesis via the alkylation of benzene with ethylene relies on fossil fuels, requiring high temperatures and toxic catalysts that contribute to ...
Mwafaq Ibdah, Giovanni D'Ambrosio, Prasada Rao Kongala, Sureshkumar Mesara, Annalisa Serio, Bharadwaj Revuru, Antonello Paparella   +6 more
wiley   +1 more source

Tailoring acid-base properties on metal-free zeolite from Indonesia kaolin to enhance the CO2 hydrogenation to CH4

Case Studies in Chemical and Environmental Engineering
The catalytic thermal conversion of carbon dioxide is essential for carbon capture, storage, and utilization, helping to reduce CO2 emissions and potentially stimulating future economic activities.
Novia Amalia Sholeha, Bintang Dewanto, Stella Jovita, Reva Edra Nugraha, Yun Hin Taufiq-Yap, Maria Ulfa, Anees Ameera Fauzi, Aishah Abdul Jalil, Hasliza Bahruji, Didik Prasetyoko   +9 more
doaj   +1 more source

A Facile Strategy to Prepare Shaped ZSM-5 Catalysts with Enhanced Para-Xylene Selectivity and Stability for Toluene Methylation: The Effect of In Situ Modification by Attapulgite

Molecules, 2019
A general strategy for preparing shaped toluene methylation catalysts with enhanced para-selectivity and stability is developed by extruding ZSM-5 zeolite with attapulgite as a binder.
Yiren Wang, Yang Chang, Min Liu, Anfeng Zhang, Xinwen Guo   +4 more
doaj   +1 more source

Cross‐Scale Engineering of Single‐Atom Catalysts from Local Planar Coordination to Spatial Architectures

Small, EarlyView.
This Review presents a cross‐scale framework for single‐atom catalysts, spanning in‐plane and out‐of‐plane coordination; primary coordination, secondary‐sphere interactions, through‐space microenvironments and support interfaces; individual sites and macroscopic architectures; and static design and directed dynamic reconstruction.
Dazhi Yao, Siheng Yang, Shuhao Wang, Bernt Johannessen, Cheng Tang   +4 more
wiley   +1 more source