ORGANO-TEMPLATE FREE FER SYNTHESIS
An organo-template free method for the manufacture of a ferrierite (FER) zeolite and the ferrierite producible by the method. The method comprises (i) forming a reaction gel comprising an aluminium source, sodium and/or potassium hydroxide, and silica sol; and (ii) heating the reaction gel to a temperature and for a duration suitable for the growth of the FER zeolite. The reaction gel does not comprise seed crystals. Moreover the reaction gel does not comprise an organic structure directing agent (OSDA). The ferrierite (FER) zeolite has the following features: a) a SAR of between 11 and 20; b) a BET surface area of between 320 and 380 m 2 /g; and c) a micropore volume of between 0.1 and 0.2 cm 3 /g.
1 . A ferrierite (FER) zeolite having the following features:
a) a SAR of between 11 and 20;
b) a BET surface area of between 320 and 380 m 2 /g; and
c) a micropore volume of between 0.1 and 0.2 cm 3 /g.
2 . The FER zeolite according to claim 1 , wherein the SAR is from 11 to 18, preferably from 12 to 17.
3 . The FER zeolite according to claim 1 , wherein the BET surface area is between 347 to 355 m 2 /g, preferably 348 to 352 m 2 /g.
4 . The FER zeolite according to claim 1 , wherein the micropore volume is 0.12 cm 3 /g.
5 . The FER zeolite according to claim 1 , wherein the zeolite has a crystallinity of greater than 95%.
6 . The FER zeolite according to claim 1 , wherein the zeolite has a crystal size of no greater than 1 micron, preferably, no greater than 0.9 microns.
7 . The FER zeolite according claim 1 , wherein the 6-fold Al is less than or equal to 15%.
8 . The FER zeolite according to claim 1 , wherein the external surface area is less than or equal to 20 m 2 /g.
9 . An organo-template free method for the manufacture of a ferrierite (FER) zeolite, the method comprising:
(i) forming a reaction gel comprising an aluminium source, sodium and/or potassium hydroxide, and silica sol,
(ii) heating the reaction gel to a temperature and for a duration suitable for the growth of the FER zeolite,
wherein the reaction gel does not comprise seed crystals, and further wherein the reaction gel does not comprise an organic structure directing agent (OSDA).
10 . The method according to claim 9 , wherein the temperature of step (ii) is from 100° C. to 200° C., preferably from 110° C. to 190° C.
11 . The method according to claim 9 , wherein the duration of step (ii) is at least 20 hours, preferably from 1-6 days.
12 . The method according to claim 9 , wherein the reaction gel composition has a K 2 O/(K 2 O+Na 2 O) ratio of less than 0.1.
13 . The method according to claim 9 for making a ferrierite (FER) zeolite having the following features:
a) a SAR of between 11 and 20;
b) a BET surface area of between 320 and 380 m 2 /g; and
c) a micropore volume of between 0.1 and 0.2 cm 3 /g.
14 . A catalyst article for the treatment of an exhaust gas, the catalyst article comprising a ferrierite (FER) zeolite having the following features:
a) a SAR of between 11 and 20;
b) a BET surface area of between 320 and 380 m 2 /g; and
c) a micropore volume of between 0.1 and 0.2 cm 3 /g.
15 . The catalyst article according to claim 14 wherein the FER zeolite is disposed on and/or within a substrate.
16 . A method for the treatment of an exhaust gas, the method comprising contacting an exhaust gas with the catalyst article according to claim 14 .
17 . The method for treating an exhaust gas according to claim 16 , wherein said method comprises contacting a combustion exhaust gas containing NO X and/or NH 3 with the catalyst article to selectively reduce at least a portion of the N X into N 2 and H 2 O and/or oxidize at least a portion of the NH 3 .
18 . A system for treating an exhaust gas containing NO X , the system comprising a catalyst article according to claim 14 and a source of a reductant, wherein the reductant source is upstream of the catalyst article.