神华科技
神華科技
신화과기
NORTHWEST COAL
2014年
2期
64-68
,共5页
MTO%SAPO-34%催化剂积炭失活
MTO%SAPO-34%催化劑積炭失活
MTO%SAPO-34%최화제적탄실활
MTO%SAPO-34%Catalyst Coke Deactivation
综述了在甲醇催化转化制低碳烯烃（MTO）过程中，SAPO-34分子筛催化剂积炭失活的影响。催化剂积炭失活后，会严重影响 MTO 反应的转化率和选择性。在较高反应温度下，焦炭主要是芳烃类物质，催化剂上的积炭，是起反应活性的物种在强酸性位上继续反应生成的，焦炭会覆盖强酸中心并会堵塞微孔而产生扩散限制。SAPO-34分子筛的强酸中心及密度、晶粒尺寸，是影响催化剂积炭失活速率的主要催化剂参数，而反应温度、空速及稀释剂，是影响催化剂应用过程中积炭失活速率的主要操作变量。
綜述瞭在甲醇催化轉化製低碳烯烴（MTO）過程中，SAPO-34分子篩催化劑積炭失活的影響。催化劑積炭失活後，會嚴重影響 MTO 反應的轉化率和選擇性。在較高反應溫度下，焦炭主要是芳烴類物質，催化劑上的積炭，是起反應活性的物種在彊痠性位上繼續反應生成的，焦炭會覆蓋彊痠中心併會堵塞微孔而產生擴散限製。SAPO-34分子篩的彊痠中心及密度、晶粒呎吋，是影響催化劑積炭失活速率的主要催化劑參數，而反應溫度、空速及稀釋劑，是影響催化劑應用過程中積炭失活速率的主要操作變量。
종술료재갑순최화전화제저탄희경（MTO）과정중，SAPO-34분자사최화제적탄실활적영향。최화제적탄실활후，회엄중영향 MTO 반응적전화솔화선택성。재교고반응온도하，초탄주요시방경류물질，최화제상적적탄，시기반응활성적물충재강산성위상계속반응생성적，초탄회복개강산중심병회도새미공이산생확산한제。SAPO-34분자사적강산중심급밀도、정립척촌，시영향최화제적탄실활속솔적주요최화제삼수，이반응온도、공속급희석제，시영향최화제응용과정중적탄실활속솔적주요조작변량。
Deactivation by coke of SAPO-34 catalyst and its effect on reaction in methanol conversion to light olefins process were reviewed. Serious coking deactivation affects the conversion and light olefin selectivity of MTO process. At high reaction temperature, the coke is mainly composed of aromatics. The coke is formed on the Br-nsted acid site from active precursor, the coke covers the Br-nsted acid site, blocks the micropores and leads to diffusion limit. The Br-nsted acid site and its density, the size of SAPO-34 crystal particles are the main parameters which affect the coking rate. The reaction temperature, space velocity and diluent are the main operation variables.
