The present invention refers to a selective catalytic reduction catalyst comprising a crystalline material with the CHA zeolite structure, wherein the crystalline material is obtainable by, at least, the following steps:
i) Preparation of a mixture that comprises at least one source of water, at least one source of a tetravalent element Y, at least one source of an alkaline or alkaline earth cation A, at least one source of a trivalent element X, and at least one organic molecule OSDA1 with the structure [R1R2R3R4N+]Q-,
wherein R1, R2, R3 and R4 are selected from linear alkyl groups, and wherein R1, R2, R3 and R4 each have between 1 and 4 carbon atoms, but at least two of them must have at least two carbon atoms, and wherein Q- is an anion, being the molar composition:
n X2O3 : YO2: a A : m OSDA1 : z H2O
wherein
n ranges between 0 and 0.1;
a ranges between 0 and 2;
m ranges between 0.01 and 2;
z ranges between 1 and 200;
ii) Crystallisation of the mixture obtained in i) in a reactor; and
iii) Recovery of the crystalline material obtained in ii).
本发明涉及一种选择性催化还原催化剂,该催化剂包括一种具有CHA
沸石结构的结晶材料,其中该结晶材料至少可通过以下步骤获得:
i) 制备一种混合物,该混合物包括至少一种
水源、至少一种四价元素源 Y、 至少一种碱性或碱土阳离子源 A、至少一种三价元素源 X 和至少一种结构为 [R1R2R3R4N+]Q- 的有机分子 O
SDA1、
其中 R1、R2、R3 和 R4 选自直链烷基,R1、R2、R3 和 R4 各有 1 至 4 个碳原子,但其中至少有两个必须至少有两个碳原子,Q- 是一种阴离子,是摩尔组成:
n X2O3 : YO2 : a A : m O
SDA1 : z
H2O
其中
n 在 0 和 0.1 之间
a 在 0 和 2 之间
m 在 0.01 和 2 之间;
z 介于 1 和 200 之间;
ii) 在反应器中结晶 i) 中得到的混合物;以及
iii) 回收 ii) 中得到的结晶物质。