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Disclosed is a molecular sieve catalyst which contains molecular
sieve-containing attrition particles and virgin molecular sieve,
the attrition particles having been recycled from a catalyst manufacture
process or from a reaction system. The catalyst can be used in a
variety of catalytic reaction processes. A desired process is making
olefins from an oxygenate feedstock. The recovery and use of the
attrition particles in the catalyst is beneficial in minimizing
waste, thereby reducing problems relating to both environmental
and economic constraints.
The present invention relates to novel calix pyrroles and a process
for synthesis of calix (4) pyrroles by reacting pyrrole with cyclic
or acyclic ketones in dichloro methane (DCM) solvent over molecular
sieve catalysts which provides an eco-friendly, more economical
and selective heterogeneous method.
A SAPO-11 silicoaluminopihosphate molecular sieve, its preparation
method, and a catalyst containing the same are disclosed. The X-ray
diffraction data of the molecular sieve before removing the template
by calcination are as listed in Table 1. The molar composition of
this molecular sieve after removing the template by calcination
expressed in anhydrous oxides is Al.sub.2 O.sub.3 : yP.sub.2 O.sub.5
: zSiO.sub.2 in which y has a value of 0.60-1.20 and z has a value
of 0.05-1.3 characterized in that after removing the template by
calcination, its X-ray diffraction data are as listed in Table 3
and that the crystal structures of the molecular sieve before and
after removing the template by calcination are substantially the
same. The catalyst is composed of 10-85% by weight of said SAPO-11
molecular sieve, 0.05-1.5% by weight of Pd or Pt, and the balance
is alumina. In comparison with similar catalysts in the prior art,
when the catalyst of this invention is applied in the reaction of
hydrocarbon hydroisomerization, both selectivity and product yield
for isomerization are remarkably increased.
The present invention relates to the manufacture of novel molecular
sieve adsorbents for the separation of a gaseous mixture of oxygen,
nitrogen and argon. The adsorbent is useful for the separation of
oxygen and/or nitrogen from air. More specifically, the invention
relates to the manufacture of a molecular sieve adsorbent, which
is selective towards nitrogen from its gaseous mixture with oxygen
and/or argon and argon from its gaseous mixture with oxygen.
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