摘要:
A method of making a crystalline molecular sieve of MFI framework type, preferably ZSM-5, from a synthesis mixture comprising at least one source of tetravalent element (Y), at least one source of trivalent element (X), at least one source of alkali metal hydroxide (MOH), at least one structure directing agent (R) and water, said synthesis mixture having the following molar composition: YO2:(p) X2O3:(q) MOH:(r) R:(s) H2O, wherein (p) is from 0.005 to 0.025, (q) is from 0.05 to 0.5, (r) is from 0.05 to 0.15 and (s) is from 35 to 45, wherein the ratio of the largest dimension (L) to the smallest dimension (S) of each crystal of the molecular sieve product is at least 5, and the smallest dimension (S) is from 20 nm to 200 nm.
摘要翻译:从包含至少一种四价元素(Y)源,至少一种三价元素(X)源的合成混合物制备MFI框架型结晶分子筛,优选ZSM-5的方法,至少一种源 碱金属氢氧化物(MOH),至少一种结构导向剂(R)和水,所述合成混合物具有以下摩尔组成:YO 2:(p)X 2 O 3:(q)MOH:(r)R:(s) 其中(p)为0.005〜0.025,(q)为0.05〜0.5,(r)为0.05〜0.15,(s)为35〜45,其中最大尺寸(L)与最小尺寸 分子筛产物的每个晶体的尺寸(S)至少为5,最小尺寸(S)为20nm至200nm。
摘要:
A crystalline material substantially free of framework phosphorus and comprising a CHA framework type molecular sieve with stacking faults or at least one intergrown phase of a CHA framework type molecular sieve and an AEI framework type molecular sieve, wherein said material, in its calcined, anhydrous form, has a composition involving the molar relationship: (n)X2O3:YO2, wherein X is a trivalent element; Y is a tetravalent element; and n is from 0 to about 0.5. The material exhibits activity and selectivity in the conversion of methanol to lower olefins, especially ethylene and propylene.