EXHIBIT
23.1
CATALYTICA,
INC.
CONSENT OF ERNST
& YOUNG LLP, INDEPENDENT AUDITORS
We consent to the incorporation by
reference in the Registration Statements (Form S-8’s No. 33-62964, No.
333-09533, No. 333-33681, No. 333-57809, and No. 333-87687) pertaining to
the 1992 Stock Option Plan, the 1992 Employee Stock Purchase Plan, the 1995
Director Option Plan of Catalytica, Inc., the Wyckoff Chemical Company, Inc.
1993 Stock Option Plan, and the Wyckoff Chemical Company, Inc. Stock Bonus
Plan of our report dated January 29, 2000, with respect to the consolidated
financial statements and schedule of Catalytica, Inc., included in this
Annual Report (Form 10-K) for the year ended December 31, 1999.
San Jose,
California
March 29,
2000
