摘要：Methanol to olefins(MTO)reaction as an important non-oil route to produce light olefins has been industrialized,and received over 80% ethylene plus propylene ***,to achieve high single ethylene or propylene selectivity towards the fluctuated market demand is still full of ***-pore SAPO-14 molecular sieve is a rare MTO catalyst exhibiting extra-high propylene *** provides us a valuable clue for further understanding of the relationship between molecular sieve structure and MTO catalytic *** this work,a seconds-level sampling fixed-bed reactor was used to capture real-time product distributions,which help to achieve more selectivity data in response to very short catalytic life of *** in product distribution,especially during the low activity stage,reflect valuable information on the reaction *** with in situ diffuse reflectance infrared Fourier-transform spectroscopy,in situ ultraviolet Raman measurements and ^(12)C/^(13)C isotopic switch experiments,a reaction pathway evolution from dual cycle to olefins-based cycle dominant was *** addition,the deactivation behaviors of SAPO-14 were also investigated,which revealed that polymethylbenzenes have been the deactivated species in such a *** work provides helpful hints on the development of characteristic methanol to propylene(MTP)catalysts.

摘要：Heterostructure engineering holds exceptional promise for the development of high-performance electrocatalysts for overall water ***,production of inexpensive and high-efficiency bifunctional electrocatalysts remains a ***,we demonstrate a simple method to synthesize a paper-mulberry(Broussonetia papyrifera)-inspired Co_(9)S_(8)@CoNi_(2)S_(4)/nickel foam(Co_(9)S_(8)@CoNi_(2)S_(4)/NF)heterojunction with high catalytic activity and *** process involves in situ growth of NiCo layered double hydroxide and in situ derivatization of ZIF-67,followed by the S heteroatom *** Co_(9)S_(8)@CoNi_(2)S_(4)/NF benefits from the heterostructure and functional advantages of multidimensional building blocks including one-dimensional(1D)nanowires,2D nanosheets and *** optimized Co_(9)S_(8)@CoNi_(2)S_(4)/NF heterojunction with 10% sulphur content reveals excellent electrocatalytic activity with the lower overpotentials of 68 mV for hydrogen evolution reaction(HER)and 170 mV for oxygen evolution reaction(OER)at 10 mA cm^(-2) in the 1.0 mol L^(-1) KOH solution,which is superior to the recently reported transition metal based *** outstanding performance is attributed to the strong interface coupling between CoNi_(2)S_(4) and Co_(9)S_(8),the advantage of multidimensional structure and the customized electronic *** density functional theory suggests that the interface between Co_(9)S_(8) and CoNi_(2)S_(4) optimizes the adsorption of the multiple intermediates and further facilitates water splitting *** work offers a generic approach for heterostructure engineering design of highperformance catalytic system applications.