Abstract: The present invention discloses an oxide ceramic fiber/oxide ceramic composite material comprising primary composite materials each consisting of (a) an assembly of ceramic fibers composed mainly of a metal oxide and (b) a metal oxide ceramic which includes the ceramic fiber assembly (a) therein, the metal oxide of the ceramic (b) being different from the main component metal oxide of the ceramic fiber assembly (a) and the amount of the metal oxide ceramic (b) being 1 to 85% by weight relative to the weight of the ceramic fiber assembly (a), and a metal oxide ceramic which is a matrix for the primary composite materials and which includes the primary composite materials therein, the metal oxide of the ceramic being the same as or different from the main component metal oxide of the ceramic fiber assembly (a); and a process for producing thereof.

Abstract: The present invention discloses:

Abstract: This invention relates to a method of removing sulfur and nitrogen oxides by a dry process comprising passing a waste gas through a moving bed formed of a carbonaceous adsorbent in a direction transverse thereto to remove the sulfur oxides and adding ammonia to remove the nitrogen oxides, characterized in that in a system comprising n moving beds (n being an integer of at least 2), the waste gas is passed transversely through the first moving bed, mixed with ammonia outside the first moving bed, and then fed to the second moving bed, the similar procedure being repeated in order, and finally, the waste gas is passed transversely through the n-th moving bed, while the carbonaceous adsorbent is transported from the n-th moving bed to the first moving bed in order.

Abstract: This invention relates to a method of removing sulfur and nitrogen oxides by a dry process comprising passing a waste gas through a bed of a carbonaceous adsorbent to remove sulfur oxides and adding ammonia to remove nitrogen oxides, characterized in that at least two carbonaceous adsorbent beds are used and the carbonaceous adsorbent used mainly for removal of sulfur oxides is further used for treatment of the waste gas leaving the final carbonaceous adsorbent bed to remove the ammonia.