Abstract
Catalysts are important to the chemical industry and environmental remediation due to their effective conversion of one chemical into another. Among them, composite catalysts have attracted continuous attention during the past decades. Nowadays, composite catalysts are being used more and more to meet the practical catalytic performance requirements in the chemical industry of high activity, high selectivity and good stability. In this paper, we reviewed our recent work on development of composite catalysts, mainly focusing on the composite catalysts obtained from porous materials such as zeolites, mesoporous materials, carbon nanotubes (CNT), etc. Six types of porous composite catalysts are discussed, including amorphous oxide modified zeolite composite catalysts, zeolite composites prepared by co-crystallization or overgrowth, hierarchical porous catalysts, host-guest porous composites, inorganic and organic mesoporous composite catalysts, and polymer/CNT composite catalysts.
Highlights
In the refining and chemical industry, most processes involve catalysis and catalysts.Catalysts are indispensable to many environmental procedures from automotive exhaust treatment to industrial effluent and municipal waste treatment, which contribute to reducing pollution and other adverse environmental impacts
In order to test the catalytic performance of the MCM-22/ZSM-35 composite catalysts, pulse reactions were carried out to study the initial activity of butene aromatization with the products formed directly detected by an on-line multi-channel MAS [129]
We have presented an overview of the recent development of some composite catalysts based on porous materials for various reactions and processes of interest to the chemical industry
Summary
In the refining and chemical industry, most processes (above 80%) involve catalysis and catalysts. Since most of the practical catalytic processes are so complicated that single component catalysts cannot meet the requirements for high performance such as high activity, remarkable selectivity and good resistance to deactivation, composite catalysts, which have two or more components combined together, are much more researched and used. It is doubtful that every component contributes to the catalytic performance, there must be some effective components that do The mechanism for such good effects is the key point, and these effects may be one of those listed below: Simple supporting effect [32,33]. Due to the rapid diminishing of fossil resources and great demand for protecting the environment, it is urgent to develop new catalysts with high performance, with porous materials. Six types of porous composite catalysts are discussed, including amorphous oxide modified zeolite composite catalysts, zeolite composites obtained by co-crystallization or overgrowth, hierarchical porous catalysts, host-guest porous composites, inorganic and organic mesoporous composite catalysts and polymer/CNT composite catalysts
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